Improvement in steam-boilers



N. n. HARVEY.

k Steam-Boilers.

` No 149 95L Pat'ented`April7,1874.

Inventor:

UNITED STATES PATENT OEEICEo NIC-OLAS D. HARVEY, OF NEIV ORLEANS, LOUISIANA.

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 149,395, dated April 7, 1&74; application tiled January 17, 1874. i

To all 'whom it may concern:

Be it known that I, NICOLAS D. HARVEY, of New Orleans, in the parish of Orleans and State of Louisiana, have invented a new and useful Improvement in Steamloilers, of which the following is a specification:

The invention will first be fully described, and then pointed out in the claim.

In the accompanying drawing, Figure 1 represents a sectional side elevation of my improved boiler. Fig. 2 is a horizontal section of Fig. l, taken on the line x. Fig. 3 is a vertical crosssection taken on the line y y of Fig. 2.

Similar letters of reference indicate correspending parts.

A is an ordinary tlue-boiler, of any desired length and diameter. B B are the lines. C is the fire-box. D is the bridge-wall. The feature which distinguishes this boiler from boilers of similar construction is its water-jacket E. This jacket forms the water-legs F F, and extends back to the oth er end of the boiler and across the end, as seen at G. rlhe bridge-wall is also a water-back, connected with the waterspace H ofthe boiler by the water-connecting tube I. J is a stand under the ilues B B,which rests on the bottom of the boiler. K are stays, by meansl of which the plates of the jacket are connected together. The inner plate L of the jacket is riveted to the shell A. The outerl plate M extends farther up, or near to the top of the shell A, where it is also riveted, or a steam-tight joint is made. N represents a series of holes, by which the steam-space of the jacket is brought in communication with the steam-space of the boiler. O is a mud-drum, connected at the top, near the ends, with the jacket. It will be observed that the jacket eX- tends down on each side of the boiler, from the inclined bridgewall to the end jacket, so that the side of the fire-nue I is rendered steamgenerating surface. As seen in Fig. 3, the

boiler is almost entirely enveloped by the water-jacket. The lower side of the fire-flue P may be covered with sheet-ironorrendered tight in any suitable manner, so that such covering may be removed for repairs or other purposes without difficulty.

This boiler may be readily put up and ren dered very effective without mason-work, and is specially adapted for steamboats, and for all situations where weight as well as space is an object.

I am aware that boilers have been constructed with a water-jacket to form thesides of the fire-box, and also a bridge-wall, but I am not aware that the sides of the fire-Hue back of the bridge-wall, or the back ends of such boilers, have been thus jacketed; nor am I aware that the mud-drum has been connected with such jacket.

In this arrangement the feed-water is pumped into the jacket, and not directly into the boiler. Before the feedwater enters the boiler it is heated to the boiling temperature, and the sediment is deposited in the jacket, and readily inds its way to the mud-drum, and is blown off. The water in the boiler is, therefore, kept comparativelyT pure. The generation of steam is greatly facilitated when the boiler is kept free from scale.

Having thus described my invention, I claim as new and desire to secure by Letters Patentrlhe combination, with the furnace, of aboiler having the ilues I) B, water-brid ge wall D, connected by pipes I to the boiler, the water-legs E, connected by mud-drum O, and the waterspace H, substantially as described, and for the purpose set forth.

N. D. HARVEY. lllitnesses:

Ons. LoUeUE, CH. E. FRAMDAIs. 

